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useMemo vs. memo
The Real Difference Between useMemo and memo in React
Understanding the nuances of performance optimizations in React applications. Here’s when to use the hook vs. the HOC.
Introduction: React useMemo Hook vs. memo HOC
React, the popular JavaScript library for building user interfaces, provides a suite of tools and techniques to optimize the performance of your applications. Among them, useMemo and memo are two commonly used techniques to prevent unnecessary re-rendering of components. Despite their similar goals, they differ significantly in terms of their implementation and use cases. In this article, we'll dissect the real differences between useMemo and memo in React, as well as explore their appropriate use cases with emoji-based code examples.
🎯 useMemo: A Hook for Caching Values
useMemo is a hook that allows you to cache a value that is computationally expensive to create or remains the same between renders. It takes a function and a dependency array as its arguments. The function is only executed when one of the dependencies changes, ensuring that the value is recalculated only when necessary. Here's an example using emojis:
